Connecting nipple for cast-iron heating-boiler elements



A. BRAHM CONNECTING NIPPLE FOR CA S'I IRON HEATING BOlfLER ELEMENTS June 7, 1927.

Filed Anril -'7,. 1926 A Mm M digi Patented June 7, 1927. i i r i v UNITED STATES PATENT OFFICE.

ALBERT Bas ns, or DUSISELDORF-RATIYI, enn ANY. I CONNECTING NIrrLn FOR CAST-IRON HEATING-BOILER ELEMENTS.

Application filed April 7, 1926, Serial No. 100,341, and in Germany March 25, 1925.

This invention relates to a connecting nipure is a cross-section on line 3+3 of Fig. 2, pie for the elements of cast-iron heating and Figure at a view of a complete connect- 40 i boilers, and the object of the invention is to ing nipple. V

replace the heretofore used connecting nip- On the drawing, a denotes the elastic v 5 pies consisting of one piece and to prevent sleeve proper which consists, preferably of thereby a breaking at the connecting bosses iron, and o c are two rings forming hollow as well as cracks or splits formed at other truncated cones Welded together with the 4; places of the boiler members; sleeve (0 at the outwardly bent edges 03 thus The characteristic features of the imforming a hollow space between the sleeve proved connecting nipple are constituted by and the rings adapted to give a certain elasa metallic elastic sleeve and two metallic ticity to the whole of the connecting nipple. rings shoved upon said sleeve, and welded to The length of the rings 6 c is such that a it, said rings being conical and forming a gap 0 remains between their neighbouring I gap between their neighbouring end faces. end faces. The shape and diameter of the The conicalness of the rings is such that rings Z) 0 correspond to that of the bores 7 they fit into the bores of the branches proof the boiler elements, as shown in Fig. l. vided at the boiler elements. I claim :1 p

Owing to the elasticity of the sleeves they An elastic connecting nipple for cast iron can give way and follow the expansions and heating elements of boilers comprising in 0 contractions of the boiler elements whereby combination a metallic sleeve having its ends the drawback experienced with the former outwardly bent, two metallic rings encomconnecting members are obviated. The expassing said sleeve, each ring being firmly ca pansions and contractions take place parconnected at its outer end'to the respective tieularly quickly when the heating comoutwardly bent end of said sleeve, said rings mences and ceases but even in these cases having an internal diameter substantially cracks and fractures can be completely pregreater than the external diameter of said vented by means of the improved connecting sleeve and the combined length of said rings 05 nipples. being less than the length of said sleeve,

The invention is illustrated diagrammatiwhereby to provide a space between said cally and by way of example in the accomsleeve and said rings and a gap between the panying drawing in which Figure 1 shows a opposed ends of said rings, said rings being vertical section through a few, heating boiler exteriorly shaped to fit into connecting 70 elements provided with the new connecting bosses of the boiler element-s substantially as nipples; Figure 2 is an axial section through described and set forth.

one of these nipples, that is to say, through In testimony whereof I have hereunto the sleeve and its appertaining two rings, signed my name this 2nd day of March, this figure being drawn to a considerably 1926. enlarged scale relatively to Fig. 1; Fig- ALBERT BRAHM. 

